I have TV installed on a Debian machine. That machine has no restrictions on internet access. I can log into the TV management console, using my TV account.
However this machine just cannot - or will not - log into the "Computers and contacts" module of TV. I enter the credentials (which work on all my other machines). There is a delay, and then a message "the server could not be contacted".
If I go to "Extras" and "Options" and try to assign it to the account, there is a delay, then nothing. No error message, and the status remains "noit assigned to account".
I have deleted the logfiles and there is nothing being logged when this happens, so I have nothing to go on.
I have assigned my (Debian) laptop to my TV account, and it can access the "computers and contacts" section fine.
If it helps, I had this issue a couple of years ago. I never resolved it then, and had to move away from TV. I'd rather crack it this time.
The TV control panel on the non-connecting Debian box says "Ready to connect (secure connection).